Fuel pump



Feb. 2, 1937.. w RAY ET AL I 2,069,327

FUEL PUMP FIIS 'J INVENTORS Wi/flam 2. Bay MAY/gem ,4. 269/ ATTO Y.

Feb. 2, 1937. w. A. RAY EI AL 2,069,327

FUEL PUMP Filed Dec. 11, 1935 2 Sheets-Sheet 2 WWI/l mar/MU ATTORNEY.

Patented Feb. .2, 1937 UNITED si-A'res FUEL PUMP William A. Ray and William a. Bay, San Francisco, Calif., assignors to General Controls Company, a corporation of California Application December 11, 1935, Serial No. 53,9241

lClaim. (cl. 103-87) This invention relates to fuel pumps. Particularly a pump for supplying oil under pressure to an oil burner utilized in a furnace.

In domestic heating installations, the supply of oil to an oil burner presents a problem which is quite diflicult inasmuch as one must provide an installation which does not need attention. Since the flow of oil will vary with the temperature thereof and since a substantially constant amount of oil must be supplied to the burner to 5 R. Ray as Patent 1,791,012 of February 2, 1931,

1,701,191 of February 5, 1929, 1,670,741 of May 22, 1928 and 1,657,807 of January 31, 1928.

In accordance with the present invention we provide a fuel pump construction and a system 0 for supplying an oil burner with oil in such a fashion that the supplying of a substantially constant quantity of oil is possible. Further, in accordance with the present invention, we have provided a fuel pump permitting ready adjustment to any one of various operating conditions apt to be encountered in installing a fuel oil burner.

It is in general the object of the present invention to improve upon fuel oil supply systems fordomestic fuel oil burner installations.

Another object of the present invention is to provide anovel fuel pump construction. A further object of the present invention is to provide a pump construction enabling a substantially constant quantity of oil to be supplied to fuel oil burner in a domestic installation.

The invention includes other objects and feaof advantag some of which, together with the foregoing, will appear hereimfter wherein thepresentpreferredformoffuelpumpof our invention and the system for supplylnil fuel oil to a bumer is disclosed.

In the drawings accompanying and forming a parthereoLFigure 1isasidevlew,partlyinsection, to a fuel pump of our invention.

Figure2isasectiontaken alongthe line 2-4 of'l'lgure 1 whileFigure 3isasectiontakenalong the line I-4 of Figure 1.

Briefly stated, in the present invention, we provide a fuel oil supply system for a fuel oil burnerv comprising a first pump which draws oil from a storage tank and into a vessel. A second pump is provided for withdrawing oil fromthisvesseLsurplusoilreturnhigtothesup 'sgnlytankthroughanoverflowline. ll'eansare provided for driving the second pump at a closely regulated rate so that an exact rate offuel oil supply can be secured. I

To simplify'construction we provide a casing 6. This can be a diecasting having a flange l extending from the side wall of the casing to receive a flange 8 on a sheet metal base 9.

Mounted within the casing and attached there-'- to is a first gear pump II. An inlet pipe l2 from a. fuel oil supply tank (not shown) communicates m withintake l3 of the pump. This pump includes a driving gear l4 mounted on drive shaft [6 and a driven gear ll mounted upon idler shaft II. The pump discharges through outlet l9 into a sump provided by easing 6 and base 9. An'over- 15 flow pipe 2| leads back from the casing to the fuel oil supply tank.

A- motor 12 is mounted upon the top of the casing and carries a V belt pulley 23. This pulley, in conjunction with a suitable V belt drives 20 V belt pulley 24 mounted upon drive shaft ii of pump H, In practice the first gear pump is driven at a relatively high rate, say to supply forty gallons per hour to the sump provided by casings 6 and 9.

For discharging oil a second gear pump 3| is provided. This pump draws in oil through inlet 32 from withinthe casing and discharges the oil through outlet 33 directly to a fuel oil burner (not shown). a

For driving of the second fuel pump a drive shaft 3i extends from the side of the casing and carries a V belt pulley 31. This pulley is adapted to cooperate with a pulley 38 on the motor drive shaft to provide a plurality of speed changes, 3 each of the pulleys being stepped in a complementary manner. Shaft it within casing i carries gears 39 and II pinned thereto. These gears are of a different size and cooperate with idler gears 4| and 42 mounted upon counter-shaft u. 40

Each idler gearincludes a notch 44 to receive a projection 46 on a collar ll. Collar 41 is splined to counter-shaft l3 and is slidable by mums of fork 48 to engage a projection 46 with notch 44 on either of the idler gears. p 45 The fork 18 engages the collar and, with rod II, provides a shifting means. Rod ii is carried in plate 52. This plate includes slots 53 enga n studs 5 to permit-a sliding to the light or left of the fork.

Also mounted upon the counter-shaft 43 are idler gears 57 and 58 cooperating with gears 59' and SI keyed to pump drive shaft 62. Thisjshaft carries driven gear 63 in the pump. the shaft being supported between the casing for pump it and the s casing for pump il. Idler gears 51 and it include notches 64 which are engaged by projections 6 in a selective manner, the projections being mounted upon a slidable collar 61 splined to shaft 43. A fork i8 is provided for sliding the collar, a rod 69 and a plate H cooperating with studs I2 in a manner similar to that previously described in connection with the shifting of collar 48 between gears 4| and 42.

In operation, with motor '22 revolving, the pump H is driven at a rate sufficient to supply 011 at about forty gallons per hour. The various speed change mechanisms provided for the driving of the pump 3| permit of sixteen selective different speeds so that pump if can be utilized to supply 011 at almost any desired rate without having to tear apart the whole pump structure and change any gears in the pump or gears iii the casing proper. The sixteen different driving speeds are secured bychanging the position of the belt used to connect the multIstep pulleys I1 and 38, four diiferent driving speeds being thus provided. As appears in Figure 2, countershaft 43 is driven by gear 4| enmeshed with gear 39 when plate 52 is in the position shown. When plate 52 is moved to the right to engage gear 46 withgear 44, the countershai't is driven at a different speed, gear 42 being enmeshed with gear 40. This change provides two additional speeds. Two further speed changes are provided by sliding plate Ii from that position in which it appears in Figure 2 to the right in Figure2 so that gear 66 engages gear 58 and gear 6|, enmeshed with gear 58, is driven in place of gear 58. By selectively changing the belt connecting pulleys 31 and 38 and by selectively sliding plates 52 and H to either the right or the left the sixteen different speeds can be secured.

The size of pump il relative to pump3l is generally such that pump ll supplies far more oil than is necessary, the excess being retumed through the overflow line. In practice, the pump such as described is set very close to the burner so that pump 3| discharges directly into the burner through its connecting fying the installation.

It is to be noted that the gear pump 3| is operated at such a speed that slippage therein is substantially absent. Therefore, by controlling the speed of the pump any desired displacement is avaflable and fuel oil can be supplied to an oil burner at a desired rate independently of oil viscosity, the pump 3| acting to measure the fuel. Thus we have eliminated the necessity for the complicated'system's used heretofore to offset the effect of viscosity, since the pump 3| is so situated and the system is such that the effect of viscosity is absent. Instead of a gear pump a piston type can be used although this type of pump involves the use of more parts.

We claim:

A fuel oil burner supply unit comprising 9. casing, a motor on said casing and having a power take off at each end thereof, a first pump in said. casing for pumping oil into the casing and including a shaft extending out of said casing for driving from one of said power take offs, a second pump in said casing for )umping. oil therefrom, and variable speed means provided between said other power take off and said second pump and including a driven shaft extending out of said casing and carrying a multi-step pulley cooperat ing with a like pulley on said other power take off, a countershaft in said casing, and variable speed gear means for driving said countershaft from said driven shaft and for driving said second pump from said countershaft.

WILLIAM A. RAY. WILLIAM R. RAY.

line, thus simp1i-- 

